Motor and pump device

ABSTRACT

A motor may include a rotor including a rotating shaft that protrudes to a first side in an axial direction; a stator disposed on an outer peripheral side of the rotor; a resin sealing member that covers the stator; and a cover member that is disposed on the first side of the resin sealing member and supports the rotating shaft. The resin sealing member may include a resin sealing member side position regulating surface that makes contact in the axial direction with a cover member side position regulating surface provided on the cover member, and a resin sealing member side securing surface that faces, in the axial direction and with a gap, a cover member side securing surface provided on the cover member. At least a portion of the resin sealing member side securing surface is secured to the cover member side securing surface via an adhesive agent layer.

CROSS REFERENCE TO RELATED APPLICATIONS

This is the U.S. national stage of application No. PCT/JP2016/085844,filed on Dec. 2, 2016. Priority under 35 U.S.C. § 119(a) and 35 U.S.C. §365(b) is claimed from Japanese Application No. 2015-241268, filed Dec.10, 2015; the disclosures of which are incorporated herein by reference.

TECHNICAL FIELD

At least an embodiment of the present invention relates to a pump deviceand a motor used for the pump device.

BACKGROUND

Patent Literature 1 discloses a pump device that rotates an impeller bymeans of a motor. The motor used in the pump device of Patent Literature1 includes a rotor and a stator disposed on the outer peripheral side ofthe rotor, wherein the stator is covered and sealed with a BMC resin. Acover member (upper case) that forms a pump chamber is secured by screwsto a resin sealing member covering the stator. The stator includes astator core, an insulator, and a coil wire wound around the insulator.The coil wire is connected to a connector for external connectionthrough a substrate. In the connector, a connection portion with thesubstrate is covered with the resin sealing member, but a terminal forexternal connection protrudes in the radial direction from an outerperipheral surface of the resin sealing member.

CITATION LIST

[Patent Literature 1] Japanese Unexamined Patent Application PublicationNo. 2016-3580

In the motor described in Patent Literature 1, because the cover member(upper case) constituting the pump chamber is secured by screws to theresin sealing member, a securing screw is required, and it is necessaryto provide a screw securing portion in the upper case and in the resinsealing member. Therefore, the number of parts is large and thestructure is complicated. If an adhesive agent is used for bondingpurposes without using a screw, for example, bonding can be achieved asa result of interposing an adhesive agent on a part where the upper caseand the resin sealing member make contact in the axis line direction ofthe motor. However, if an adhesive agent is used for bonding purposes,protrusion of the adhesive agent occurs due to excessive application ifthe amount of adhesive agent is not strictly controlled. Furthermore, ifthe surfaces in which the upper case and the resin sealing member makecontact in the axis line direction (position regulating surfaces) serveas bonding surfaces (securing surfaces), there is a concern that theaccuracy with which the upper case is positioned could decrease as aresult of the adhesive agent interposed between the bonding surfaces.

SUMMARY

In view of the above problems, at least an embodiment of the presentinvention achieves, in a motor which includes a resin sealing memberthat covers a stator, a more simple structure for joining the resinsealing member and an upper case, and improves the accuracy with whichthe cover member is positioned with respect to the resin sealing member.

In order to solve the above problems, a motor of at least an embodimentof the present invention includes: a rotor provided with a rotatingshaft that protrudes on a first side in an axis line direction; a statordisposed on an outer peripheral side of the rotor; a resin sealingmember that covers the stator; and a cover member that is disposed onthe first side of the resin sealing member and supports the rotatingshaft; wherein the resin sealing member includes a resin sealing memberside position regulating surface that makes contact in an axis linedirection with a cover member side position regulating surface providedon the cover member, and a resin sealing member side securing surfacethat faces, in the axis line direction and with a gap, a cover memberside securing surface provided on the cover member; and at least aportion of the resin sealing member side securing surface is secured tothe cover member side securing surface via an adhesive agent layer.

In the motor of at least an embodiment of the present invention, aposition regulating surface in which the cover member and the resinsealing member make contact, and securing surfaces in which the covermember and the resin sealing member are secured by an adhesive agent areseparately provided. As a result, the cover member and the resin sealingmember can be brought into contact and positioned with high accuracy,while being configured such that the securing surfaces face each otherwith a gap in which the adhesive agent is disposed. Therefore, theaccuracy with which the cover member can be positioned in the axis linedirection with respect to the resin sealing member can be improved.Furthermore, by using an adhesive agent to secure the resin sealingmember and the cover member, it is not necessary to provide a securingstructure such as a screw securing portion or a hook. Therefore, thestructure of the securing location can be simplified.

In at least an embodiment of the present invention, it is desirable thata first adhesive agent reservoir portion is provided which recessesfurther on the first side than the cover member side securing surface.In this manner, the adhesive agent that protrudes from the cover memberside securing surface is retained in the first adhesive agent reservoirportion. Therefore, even if the application amount of the adhesive agentis not strictly controlled, adverse effects that arise due to protrusionof the adhesive agent caused by excessive application can be suppressed.

In at least an embodiment of the present invention, the first adhesiveagent reservoir portion doubles as a hollow shape of the cover member.In this manner, the molding properties of the cover member can beimproved.

In at least an embodiment of the present invention, it is desirable thatthe cover member side securing surface is disposed on an outerperipheral side of the first adhesive agent reservoir portion. If theadhesive agent is excessively applied, there is a concern that therotation of the rotor may be adversely affected if protrusion of theadhesive agent occurs on the inner peripheral side, however thelikelihood that the adhesive agent protruding on the inner peripheralside will reach the rotor is low as long as the first adhesive agentreservoir portion is disposed on the inner peripheral side of thesecuring surface. Therefore, the adverse effects that arise due toprotrusion of the adhesive agent can be suppressed.

In at least an embodiment of the present invention, it is desirable thatthe first adhesive agent reservoir portion is formed in plurality, andconvex portion that protrude on a second side in the axis line directionand at the same height as the cover member side securing surface areformed between the plurality of first adhesive agent reservoir portions.In this manner, because the tip surfaces of the convex portions can beused as a securing surface for securing purposes by the adhesive agent,the area of the securing surface can be ensured. Furthermore, thestrength of the cover member can be ensured by means of the convexportions. For example, if ribs extending radially inward from the covermember side securing surface are provided as convex portions, thestrength of the cover member can be ensured by means of the ribs.Moreover, as a result of providing ribs extending radially inward fromthe cover member side securing surface, the securing surface can beextended to the inner peripheral side. Therefore, the securing strengthcan be ensured. Furthermore, because the adhesive agent collects alongthe edge of the radially extending rib due to surface tension, thedetent effect of the cover member can be increased.

In at least an embodiment of the present invention, it is desirable thatthe resin sealing member side position regulating surface is disposedfurther on the second side in the axis line direction than the resinsealing member side securing surface, and a second adhesive agentreservoir portion is formed between the cover member side positionregulating surface and the cover member side securing surface. In thismanner, if the adhesive is excessively applied, the adhesive thatprotrudes on the outer peripheral side is accommodated in the secondadhesive agent reservoir portion, and therefore, the likelihood of theprotruding adhesive agent reaching the cover member side positionregulating surface is low. Therefore, it is possible to suppress areduction in the accuracy with which the cover member is positioned inthe axis line L direction with respect to the resin sealing membercaused by protrusion of the adhesive agent. Furthermore, the secondadhesive agent reservoir portion is capable of suppressing protrusion ofthe adhesive agent toward the outer peripheral surface of the motor.

In at least an embodiment of the present invention, it is desirable thatthe cover member includes a protrusion portion which protrudes furtheron the second side in the axis line direction than the cover member sideposition regulating surface, and covers an outer peripheral side of theresin sealing member. In this manner, a corner portion that connects theouter peripheral surface of the resin sealing member and the resinsealing member side position regulating surface can be protected by thecover member. Moreover, if the outer peripheral surface of the resinsealing member is configured such that the entire circumference iscovered by the protrusion portion, water and the like can be preventedfrom entering between the cover member and the resin sealing member,yielding a waterproof effect.

In this case, a configuration can be employed in which an engagementprotrusion portion is provided on an outer peripheral surface of theresin sealing member, and the protrusion portion includes a rotationengagement portion that engages the engagement protrusion portion byrotating the cover member around the axis line in a state where thecover member side position regulating surface and the resin sealingmember side position regulating surface are in contact with each other.In this manner, because the cover member is relatively rotated withrespect to the resin sealing member when the rotation engagement portionis engaged, the adhesive agent can be spread in the circumferentialdirection.

In at least an embodiment of the present invention, it is desirable thatthe cover member side securing surface and the resin sealing member sidesecuring surface are provided on the entire circumference. In thismanner, because the adhesive agent can be distributed over the entirecircumference, the adhesive agent is capable of preventing the entry ofwater and the like toward the rotor side, providing a waterproof effect.Therefore, an O-ring can be omitted, and costs can be reduced.Furthermore, for example, if a rotation engagement structure is providedby way of a rotation engagement portion and an engagement protrusionportion provided between the cover member and the resin sealing member,the adhesive agent reaches the entire circumference due to the rotationof the cover member and provides a waterproof effect, and further,malfunctions such as the twisting of the O-ring caused by rotation ofthe cover member can be resolved.

In at least an embodiment of the present invention, a configuration canbe employed wherein the stator includes a substantially annular statorcore, at least an outer peripheral section of an end surface on thefirst side of the stator core is exposed from the resin sealing member,and the resin sealing member side position regulating surface isprovided on an outer peripheral side of the end surface and ispositioned on the same plane as the end surface. In this manner, theouter peripheral side of the end surface of the stator core, which ispositioned so as to make contact with a mold at the time of molding, canbe covered and insulated by the cover member.

Furthermore, in order to solve the above problems, a motor of at leastan embodiment of the present invention includes: a rotor provided with arotating shaft that protrudes on a first side in an axis line direction;a stator disposed on an outer peripheral side of the rotor; a resinsealing member that covers the stator; and a cover member disposed onthe first side of the resin sealing member and supports the rotatingshaft; wherein the resin sealing member includes a resin sealing memberside position regulating surface that makes contact in an axis linedirection with a cover member side position regulating surface providedon the cover member, and a resin sealing member side securing surfacethat faces, in a direction orthogonal to the axis line direction andwith a gap, a cover member side securing surface provided on the covermember; and at least a portion of the resin sealing member side securingsurface is secured to the cover member side securing surface via anadhesive agent layer.

In at least an embodiment of the present invention, it is desirable thatthe cover member includes a cover member ceiling portion and a covermember cylindrical portion that protrudes on a second side in the axisline direction from the cover member ceiling portion, the cover memberside securing surface serves as a cover member cylindrical portion, andthe resin sealing member side securing surface serves as an outerperipheral surface of the resin sealing member.

Next, a pump device of at least an embodiment of the present inventionincludes: the motor described above; and an impeller attached to an endportion of the rotating shaft which passes through the cover member andprotrudes on the first side of the cover member.

According to at least an embodiment of the present invention, as aresult of separately providing a position regulating surface on which acover member and a resin sealing member make contact, and securingsurfaces on which the cover member and the resin sealing member aresecured by an adhesive agent, the cover member and the resin sealingmember can be brought into contact and positioned with a high accuracywhile being configured such that the securing surfaces face each otherwith a gap in which the adhesive agent is disposed. Therefore, theaccuracy with which the cover member can be positioned in the axis linedirection with respect to the resin sealing member can be improved.Furthermore, by using an adhesive agent to secure the surfaces, it isnot necessary to provide a securing structure such as a screw securingportion or a hook. Therefore, the structure of the securing location canbe simplified.

BRIEF DESCRIPTION OF THE DRAWINGS

Embodiments will now be described, by way of example only, withreference to the accompanying drawings which are meant to be exemplary,not limiting, and wherein like elements are numbered alike in severalFigures, in which:

FIG. 1 An external perspective view of a pump device to which at leastan embodiment of the present invention has been applied.

FIG. 2A and FIG. 2B A cross-sectional view of the pump device and apartially enlarged view thereof.

FIG. 3 An exploded perspective view of a motor viewed from the outputside.

FIG. 4 An exploded perspective view of the motor viewed from the counteroutput side.

FIG. 5 A perspective view of a stator viewed from the counter outputside.

FIG. 6 A perspective view of the stator viewed from the output side.

FIG. 7 An exploded cross-sectional view of the motor.

FIG. 8 A plan view of a cover member viewed from the counter outputside.

FIG. 9A and FIG. 9B An enlarged cross-sectional view of an adhesivesecuring portion between a resin sealing member side securing surfaceand the cover member.

DETAILED DESCRIPTION Embodiment 1

Hereinafter, Embodiment 1 of a pump device and a motor to which at leastan embodiment of the present invention has been applied is describedwith reference to the drawings.

(Overall Configuration of Pump Device)

FIG. 1 is an external perspective view of a pump device 1 to which atleast an embodiment of the present invention has been applied.Furthermore, FIG. 2A is a cross-sectional view of the pump device 1, andFIG. 2B) is a partially enlarged view of region A in FIG. 2A. The pumpdevice 1 includes: a motor 2; a case body 3 attached to the motor 2 thatforms a pump chamber 4 between the motor 2 and the case body 3; and animpeller 6 which is attached to a rotating shaft 5 of the motor 2 anddisposed inside the pump chamber 4. The case body 3 is provided with afluid inlet port 7 and discharge port 8. When the motor 2 is driven torotate the impeller 6, fluid such as water drawn from the inlet port 7is discharged from the discharge port 8 via the pump chamber 4.

In the present specification, reference numeral L indicates the axisline direction of the motor 2, where the output side L1 represents afirst side in the axis line L direction, and the counter output side L2represents a second side in the axis line L direction. FIG. 1 is anexternal perspective view of the pump device 1 as viewed from thecounter output side L2. The rotating shaft 5 of the motor 2 extends inthe axis line L direction. Furthermore, the side on which the impeller 6is disposed with respect to the motor 2 is referred to as the outputside L1, and the opposite side to the output side L1 is referred to asthe counter output side L2. Furthermore, the direction orthogonal to theaxis line L is referred to as the radial direction, and the axis line Lperiphery is referred to as the circumferential direction. As shown inFIG. 2A and FIG. 2B, the inlet port 7 is provided in a positionoverlapping the axis line L of the rotating shaft 5 of the motor 2inside the case body 3, and the discharge port 8 is provided outside therotating shaft 5 in the radial direction.

FIG. 3 is an exploded perspective view of the motor 2 viewed from theoutput side L1, and FIG. 4 is an exploded perspective view of the motorviewed from the counter output side L2. FIG. 3 and FIG. 4 show a statein which a cover member 14 that constitutes a housing 12 of the motor 2has been detached from a resin sealing member 13. The motor 2 is a DCbrushless motor, and includes a rotor 10, a stator 11, and a housing 12that houses these components. The housing 12 includes the resin sealingmember 13 that covers the stator 11 from the counter output side L2, andthe cover member 14 that covers the resin sealing member 13 from theoutput side L1. The cover member 14 is secured to the resin sealingmember 13.

The case body 3 is placed on the cover member 14 from the output sideL1. As a result, the space partitioned between the cover member 14 andthe case body 3 forms the pump chamber 4. The resin sealing member 13retains a first bearing member 15 that rotatably supports the counteroutput side L2 end portion of the rotating shaft 5 of the rotor 10. Thecover member 14 retains a second bearing member 16 that rotatablysupports the middle of the rotating shaft 5. The output side L1 endportion of the rotating shaft 5 protrudes from the housing 12 of themotor 2 toward the inside of the pump chamber 4, and the impeller 6 isattached thereto.

(Rotor)

As shown in FIG. 2A and FIG. 2B, the rotor 10 includes a rotating shaft5, a magnet 20 surrounding the rotating shaft 5, and a retaining member21 that retains the rotating shaft 5 and the magnet 20. The magnet 20has an annular shape and is coaxially disposed with respect to therotating shaft 5. The outer peripheral surface of the magnet 20 has Npoles and S poles alternatingly magnetized in the circumferentialdirection. The rotating shaft 5 is made of stainless steel. The rotatingshaft 5 has an annular groove formed near the center in the axis line Ldirection, and an E-ring 24 is secured to the annular groove. The E-ring24 is a plate-shaped member made of metal. The E-ring 24 is embedded inthe output side L1 end surface of the retaining member 21.

The rotor 10 includes a first bearing plate 45 disposed on the counteroutput side L2 of the retaining member 21, and a second bearing plate 46disposed on the output side L1 of the retaining member 21. The firstbearing plate 45 and the second bearing plate 46 are substantiallyannular metal plates. For example, the first bearing plate 45 and thesecond bearing plate 46 are metal washers. The first bearing plate 45covers the counter output side L2 end surface of the retaining member 21in a state where the rotating shaft 5 is passing through the centerhole. Furthermore, the second bearing plate 46 covers the output side L1end surface of the retaining member 21 and the E-ring 24 in a statewhere the rotating shaft 5 is passing through the center hole. Thesecond bearing plate 46 makes surface contact with the E-ring 24. Thefirst bearing plate 45 and the second bearing plate 46 are respectivelyretained by the counter output side L2 end surface and the output sideL1 end surface of the retaining member 21. The sliding heat generated asa result of the second bearing plate 46 and the second bearing member 16sliding during rotation of the rotor 10 is transmitted to the rotatingshaft 5 via the E-ring 24, and then dissipated.

(Stator)

FIG. 5 and FIG. 6 are perspective views of the stator 11, where FIG. 5is a perspective view viewed from the counter output side L2, and FIG. 6is a perspective view viewed from the output side L1. The stator 11includes an annular stator core 51 positioned on the outer peripheralside of the rotor 10, a plurality of coils 53 wound around the statorcore 51 via insulators 52, and a connector 54 for connecting a powersupply line that supplies power to the coils 53.

The stator core 51 is a laminated core formed by laminating thinmagnetic plates made of a magnetic material. As shown in FIG. 5 and FIG.6, the stator core 51 includes an annular portion 56 and a plurality ofsalient pole portions 57 that protrude radially inward from the annularportion 56. The plurality of salient pole portions 57 are formed with anequal angular pitch, and are disposed with a constant pitch in thecircumferential direction. The inner peripheral side end surfaces 57 aof the salient pole portions 57 are arc-shaped surfaces with the axisline L as the center. The inner peripheral side end surfaces 57 a of thesalient pole portions 57 face the outer peripheral surface of the magnet20 of the rotor 10 with a slight gap.

The insulators 52 are formed from an insulating material such as aresin. The insulators 52 have a flanged cylindrical shape and areprovided with a flange portion at both ends in the radial direction. Theinsulators 52 are attached to each of the plurality of salient poleportions 57. The coils 53 are wound around each of the plurality ofsalient pole portions 57 via the insulators 52. The insulators 52partially cover the counter output side end surface 56 a (see FIG. 6) ofthe annular portion 56 of the stator core 51, but the outer peripheraledge section of the counter output side end surface 56 a is not coveredby the insulators 52. Similarly, the insulators 52 partially cover theoutput side end surface 56 b (see FIG. 5) of the annular portion 56 ofthe stator core 51, but the outer peripheral edge section of the outputside end surface 56 b is not covered by the insulators 52.

The coils 53 are constituted by a conductive wire 55 made of an aluminumalloy or a copper alloy. In the present embodiment, a conductive wire 55in which an aluminum alloy is covered with a copper alloy is used.Furthermore, in the present embodiment, the number of salient poleportions 57 and coils 53 is nine. The motor 2 is a three-phase brushlessmotor, in which three of the nine coils 53 are U-phase coils, three ofthe remaining six coils are V-phase coils, and the remaining three coilsare W-phase coils. The U-phase coils, V-phase coils, and W-phase coilsare arranged in this order in the circumferential direction. The threeU-phase coils are formed by sequentially winding a single conductivewire 55 around three salient pole portions 57, the three V-phase coilsare formed by sequentially winding a single conductive wire 55 aroundthree salient pole portions 57, and the three W-phase coils are formedby sequentially winding a single conductive wire 55 around three salientpole portions 57. The conductive wires 55 that constitute the U-phasecoils, the V-phase coils, and the W-phase coils are routed to theconnector 54.

(Connector)

The connector 54 is shaped so that a male external connector can beattached and detached. The connector 54 is connected to one of theplurality of insulators 52. The connector 54 includes a substantiallyrectangular connector housing 30, a connection portion 31 that connectsthe connector housing 30 and the insulator 52, and terminal pins 40retained by the connector housing 30. The connector housing 30 isdisposed on the outer peripheral side of the insulator 52 and on thecounter output side L2 of the stator core 51, and is connected via theconnection portion 31 to a section of the insulator 52 (flange portion52 a) positioned on the outer peripheral side of the coil 53. Theconnector housing 30 and the connection portion 31 are integrally formedwith the insulator 52.

The connector 54 is a female connector 54 that includes three terminalpins 40, namely a terminal pin 40 to which one end portion of theconductive wire 55 constituting the U-phase coils is connected, aterminal pin 40 to which one end portion of the conductive wire 55constituting the V-phase coils is connected, and a terminal pin 40 towhich one end of the conductive wire 55 constituting the W-phase coilsis connected. The other end of the conductive wire 55 constituting theU-phase coils, the other end of the conductive wire 55 constituting theV-phase coils, and the other end of the conductive wire 55 constitutingthe W-phase coils are connected to each other to form a common wire.

The connector housing 30 has a substantially rectangular shape with anopening on the counter output side L2. That is to say, the connectorhousing 30 is formed with a connection opening 30 a which is an openingon the counter output side L2. The connector housing 30 includes acylindrical portion 33 having a rectangular cylindrical shape thatextends in the axis line L direction, and a bottom portion 32 thatcloses the output side L1 end portion of the cylindrical portion 33. Theconnection opening 30 a is provided on the counter output side L2 endportion of the cylindrical portion 33. As shown in FIG. 6, thecylindrical portion 33 includes an inner side wall 33 a positioned onthe central side (that is to say, the insulator 52 side) of the stator11, an outer side wall 33 b parallel to the inner side wall 33 a, andside walls 33 c and 33 d connected to the inner side wall 33 a and theouter side wall 33 b. The internal space of the connector housing 30 isdivided into three portions by partition walls 33 e and 33 f parallel tothe side walls 33 c and 33 d. Inside each of the spaces partitioned bythe partition walls 33 e and 33 f is disposed one terminal connectionportion 41 (see FIG. 2A) corresponding to an end portion of one of theterminal pins 40. When a male external connector is attached to theconnection opening 30 a, the terminals provided on the externalconnector make contact with the terminal pins 40.

As shown in FIG. 5, the bottom portion 32 is formed having the samenumber of through holes 34 as terminal pins 40. Three terminal pins 40are attached to the connector housing 30 of the present embodiment, andtherefore, through holes 34 are formed in three locations. The threethrough holes 34 are arranged in a line in the direction orthogonal tothe radial direction of the stator 11. As shown in FIG. 2A and FIG. 5, aconcave portion 35 positioned radially inward with respect to thethrough holes 34 (that is to say, on the insulator 52 side) is formed inthe output side L1 surface of the bottom portion 32. The concave portion35 has a hollow shape that recesses on the counter output side L2, andextends in a groove shape along the direction in which the three throughholes 34 are disposed. Furthermore, the same number of through holes 36as through holes 34 (see FIG. 2A) is provided in the output side L1surface of the connection portion 31. That is to say, three pairs ofthrough holes 34 and through holes 36 are provided in the output side L1surface of the connector 54. Retaining grooves 37 that intersect theconcave portion 35 (see FIG. 5) are respectively provided between thethree pairs of through holes 34 and through holes 36. Sections of theterminal pins 40 that extend from the through holes 34 to the throughholes 36 (which are joining portions 43 as described below) are retainedby the retaining grooves 37.

The terminal pins 40 are formed by bending a metal wire having a squarecross-sectional shape. The terminal pins 40 may also be formed bybending a metal wire having a circular cross-sectional shape. As shownin FIG. 2A, the terminal pin 40 is constituted by a terminal connectionportion 41 which is press-fitted into the connector housing 30 andprotrudes toward the connection opening 30 a, a conductive wireconnection portion 42 disposed between the connector housing 30 and theinsulator 52, and a joining portion 43 which connects the terminalconnection portion 41 and the conductive wire connection portion 42. Theterminal connection portion 41 and the conductive wire connectionportion 42 extend in a direction parallel with the axis line Ldirection. Furthermore, the joining portion 43 extends in a directionorthogonal to the axis line L direction, and is connected to theterminal connection portion 41 and the conductive wire connectionportion 42 substantially at right angles.

The terminal pin 40 is attached to the connector housing 30 bypress-fitting the terminal connection portion 41 with respect to thethrough hole 34 in the axis line L direction, and passing the conductivewire connection portion 42 through the through hole 36. As describedabove, by retaining the joining portion 43 in the retaining groove 37formed in the outside surface of the connector housing 30, rotation ofthe terminal pin 40 is prevented. The tip of the conductive wireconnection portion 42 is provided with a detachment prevention portion42 a formed by bending the tip portion of the conductive wire connectionportion 42 radially inward in a substantially perpendicular fashionafter being assembled to the connector housing 30. That is to say, theconductive wire connection portion 42 is constituted by a rising portion42 b that extends along the inner side wall 33 a, and the detachmentprevention portion 42 a. The bending angle of the detachment preventionportion 42 a may be an obtuse angle rather than being substantiallyperpendicular.

As shown in FIG. 6, the three conductive wire connection portions 42 aredisposed at constant intervals in a direction orthogonal to the radialdirection along the inner side wall 33 a of the connector housing 30.The connector housing 30 includes wall portions 38 which orthogonallyprotrude radially inward from the inner side wall 33 a. The wallportions 38 are provided at two locations representing the midpointpositions between adjacent conductive wire connection portions 42. Theradially inward end edges of the wall portions 38 are positioned furtherradially inward than the rising portions 42 b. On the other hand, in thewall portions 38, the axis line L direction end edges are positionedfurther on the output side L1 than the detachment prevention portions 42a. That is to say, the wall portions 38 have a shape whose width reachesadjacent rising portions 42 b, but whose height does not reach adjacentdetachment prevention portions 42 a.

As shown in FIG. 6, the insulator 52 positioned on the inner peripheralside of the connector 54 includes a flange portion 52 a provided on theouter peripheral side of the coil 53. The insulator 52, which isintegrally formed with the connector 54, includes four cylindrical guideconvex portions 39 that protrude from the counter output side L2 surfaceof the flange portion 52 a which covers the outer peripheral surface ofthe stator core 51. The four guide convex portions 39 are arranged at aconstant pitch in the circumferential direction. One conductive wire 55is connected to each of the three conductive wire connection portions42. The three conductive wires 55, which constitute the U-phase coils,the V-phase coils, and the W-phase coils, are guided by the four guideconvex portions 39 and are routed from the coils 53 to the conductivewire connection portions 42. That is to say, the four guide convexportions 39 guide one of the three conductive wires 55 from the coils 53positioned on the inner peripheral side of the connector housing 30 tothe middle of the three conductive wire connection portions 42, guideone of the two remaining conductive wires 55 from the coils 53positioned on the first side in the circumferential direction of thecoils 53 positioned on the inner peripheral side of the connectorhousing 30 to the conductive wire connection portion 42 positioned onthe first side end in the circumferential direction, and guide the lastconductive wire 55 from the coil 53 positioned on the second side in thecircumferential direction of the coils 53 positioned on the innerperipheral side of the connector housing 30 to the conductive wireconnection portion 42 positioned on the second side end in thecircumferential direction.

The conductive wires 55 are guided by the guide convex portions 39 androuted toward the conductive wire connection portions 42, and thenrouted along the rising portions 42 b to the detachment preventionportions 42 a. Because the conductive wires 55 are routed along therising portions 42 b, short circuiting is prevented by means of the wallportions 38. The conductive wires 55 are wound around the risingportions 42 b or the detachment prevention portions 42 a, and aresoldered to the rising portions 42 b or the detachment preventionportions 42 a. As described above, because the wall portions 38 have aheight that does not reach the detachment prevention portions 42 a, asoldering iron is capable of soldering by closely approaching the upperends of the detachment prevention portions 42 a and the rising portions42 b without being blocked by the wall portions 38.

(Resin Sealing Member)

FIG. 7 is an exploded cross-sectional view of the motor 2, and is across-sectional view of a state in which the cover member 14 has beenseparated from the resin sealing member 13. As shown in FIG. 2A to FIG.4, and FIG. 7, the resin sealing member 13 includes a coil 53, aninsulator 52, and a substantially disk-shaped sealing member bottomportion 65 covering the stator core 51 from the counter output side L2.Furthermore, the resin sealing member 13 includes a connector sealingportion 66, which extends from the sealing member bottom portion 65toward the outer peripheral side and covers the connector 54, and asealing member cylindrical portion 67, which extends from the sealingmember bottom portion 65 toward the output side L1 and covers the coil53, the insulator 52, and the stator core 51. The sealing membercylindrical portion 67 has a thick cylindrical shape. The central axisline of the sealing member cylindrical portion 67 coincides with theaxis line L of the motor 2.

A bearing member retaining concave portion 68 is provided in a centralsection of the sealing member bottom portion 65. The bearing memberretaining concave portion 68 retains a first bearing member 15 thatrotatably supports the counter output side L2 end portion of therotating shaft 5 of the rotor 10. The first bearing member 15 is made ofresin, and has a shape which includes a cylindrical support portionprovided with a through hole in which the rotating shaft 5 is disposed,and a flange portion that expands from the output side L1 end portion ofthe cylindrical portion toward the outer peripheral side. The contourshape of the first bearing member 15 when viewed from the axis line Ldirection is a letter-D shape. The first bearing member 15 is secured tothe bearing member retaining concave portion 68 in a state where theflange portion is making contact with the sealing member bottom portion65 from the output side L1. In the first bearing member 15, the supportportion through which the rotating shaft 5 is inserted functions as aradial bearing of the rotating shaft 5, and the flange portion functionsas a thrust bearing of the rotor 10. That is to say, the first bearingplate 45 secured to the retaining member 21 of the rotor 10 slides onthe flange portion of the first bearing member 15.

As shown in FIG. 2A and FIG. 2B, the sealing member bottom portion 65includes a cylindrical bearing support section 65 a that surrounds thefirst bearing member 15 from the outer peripheral side in the radialdirection, a circular closed section 65 b that closes the lower endopening of the bearing support section 65 a, a coil sealing section 65 cpositioned below the coil 53, and a connection section 65 d thatconnects between the bearing support section 65 a and the coil sealingsection 65 c. The bearing support section 65 a and the closed section 65b constitute the bearing member retaining concave portion 68. Thecounter output side L2 surface of the coil sealing section 65 cincludes, along the shape of each coil 53 would around the insulator 52,a tapered surface 65 e increasingly inclined to the counter output sideL2 toward the outer peripheral side, and an annular surface 65 f whichis provided on the outer peripheral side of the tapered surface 65 e andis perpendicular to the axis line L direction.

As shown in FIG. 2A, FIG. 4, and FIG. 5, the connector sealing portion66 has a substantially rectangular shape as a whole. The connectorsealing portion 66 includes a connector sealing portion bottom portion66 a covering the output side L1 of the connector 54, a connectorsealing portion outer peripheral portion 66 b covering both the outerradial side and the circumferential direction of the connector 54, and aconnector sealing portion inner peripheral portion 66 c which ispositioned on the inner peripheral side of the connector housing 30 andcovers the counter output side L2 of the connection portion 31, andprotrudes from the sealing member bottom portion 65 to the counteroutput side L2. The connector sealing portion bottom portion 66 a andthe connector sealing portion outer peripheral portion 66 b protrudefrom the sealing member cylindrical portion 67 on the outer peripheralside. Furthermore, the connector sealing portion inner peripheralportion 66 c has a shape which is raised by one step from the annularsurface 65 f of the sealing member bottom portion 65. That is to say,the counter output side L2 end surface 66 d of the connector sealingportion inner peripheral portion 66 c is in a position that protrudesfurther on the counter output side L2 by one step relative to theannular surface 65 f of the sealing member bottom portion 65.

In the connector 54, the open end portion of the connector housing 30having the connection opening 30 a, to which a male connector isattached and detached, protrudes from the connector sealing portion 66on the counter output side L2 and is exposed to the outside. Theconnection opening 30 a is provided in a position protruding by adimension H (see FIG. 4) from the counter output side L2 end surface 66d of the connector sealing portion 66. In the connector 54, only theopen end portion of the connector housing 30 having the connectionopening 30 a is exposed to the outside, and the joining portion 43 andthe conductive wire connection portion 42 of the terminal pin 40 arecompletely covered by the connector sealing portion 66. Therefore, theconnector sealing portion 66 prevents the terminal pin 40 from fallingloose, and protects the terminal pin 40 from fluid. Furthermore, theconductive wire 55 routed from the coil 53 to the connector 54 is alsocovered by the connector sealing portion 66, and is protected fromfluid.

As shown in FIG. 2A, FIG. 2, and FIG. 3, the sealing member cylindricalportion 67 includes a large diameter cylindrical section 81 whichconnects to the sealing member bottom portion 65, and a small diametercylindrical section 82 having a smaller outside diameter dimension thanthe large diameter cylindrical section 81. The small diametercylindrical section 82 includes a first small diameter cylindricalsection 82 a which constitutes the output side L1 end portion of thesealing member cylindrical portion 67, and a second small diametercylindrical section 82 b provided between the first small diametercylindrical section 82 a and the large diameter cylindrical section 81.The first small diameter cylindrical section 82 a has a slightly smalleroutside diameter than the second small diameter cylindrical section 82b.

On the outer peripheral surface of the sealing member cylindricalportion 67 is formed a resin sealing member side position regulatingsurface 70, which is a stepped surface facing the output side L1 at theboundary section between the second small diameter cylindrical section82 b and the large diameter cylindrical section 81. The resin sealingmember side position regulating surface 70 is orthogonal to the axisline L direction. As described below, the resin sealing member sideposition regulating surface 70 is a surface that makes contact with thecover member 14 in the axis line L direction. Furthermore, the sealingmember cylindrical portion 67 includes on the output side L1 end portiona resin sealing member side securing surface 71, which is an annular endsurface orthogonal to the axis line L direction. As described below, theresin sealing member side securing surface 71 opposes the cover member14 with a predetermined gap. The cover member 14 is secured to the resinsealing member 13 by an adhesive agent disposed in the gap between theresin sealing member side securing surface 71 and the cover member 14.

The outside diameter of the large diameter cylindrical section 81 islarger than the outside diameter of the annular portion 56 of the statorcore 51, and the outside diameter of the second small diametercylindrical section 82 b is smaller than the outside diameter of theannular portion 56 of the stator core 51. Furthermore, the resin sealingmember side position regulating surface 70 is positioned on the sameplane as the counter output side end surface 56 a of the annular portion56 of the stator core 51. As a result, a plurality of arc-shaped openingportions 83 (see FIG. 3), which expose an outer peripheral edge sectionof the counter output side end surface 56 a of the annular portion 56 ofthe stator core 51 on the output side L1, is formed on an innerperipheral section of the resin sealing member side position regulatingsurface 70.

As shown in FIG. 2A, FIG. 2B and FIG. 3, the inner peripheral surface ofthe sealing member cylindrical portion 67 is provided with, from thecounter output side L2 toward the output side L1, a small diameter innerperipheral surface section 67 a, and a large diameter inner peripheralsurface section 67 b having a larger inside diameter dimension than thesmall diameter inner peripheral surface section 67 a. As shown in FIG.2A and FIG. 2B, the small diameter inner peripheral surface section 67 ais provided with a plurality of opening portions which expose the innerperipheral side end surfaces 57 a of the salient pole portions 57 of thestator core 51 to the inner peripheral side. Furthermore, as shown inFIG. 3, the small diameter inner peripheral surface section 67 a isprovided with a plurality of groove-shaped notched portions 69 thatextend in the axis line L direction. Each of the plurality of notchedportions 69 is centrally positioned in the circumferential direction ofeach salient pole portion 57 of the stator core 51, and extend from theoutput side end surface 57 b of the salient pole portion 57 (see FIG. 5)to the output side L1 end surface of the small diameter inner peripheralsurface section 67 a. Consequently, the output side end surfaces 57 b ofthe salient pole portions 57 of the stator core 51 are exposed on theoutput side L1 at the angular positions in which the notched portions 69are provided.

The outer peripheral surface of the large diameter cylindrical section81 is provided with four engagement protrusion portions 85 whichprotrude on the outer peripheral side at equal angular intervals. Theengagement protrusion portions 85 engage rotation engagement portions 86provided on the cover member 14 as described below. The engagementprotrusion portions 85 engage the rotation engagement portions 86 toregulate the detachment of the cover member 14 from the resin sealingmember 13.

The resin sealing member 13 completely covers the coil 53, and protectsthe coil 53 from fluid. Furthermore, except for the opening (connectionopening 30 a) to which a male connector is attached and detached, theresin sealing member 13 is integrally formed up to the connector sealingportion 66 covering the connector 54, and prevents the terminal pin 40assembled to the connector 54 from falling loose while also protectingthe connection portion between the terminal pin 40 and the conductivewire 55 from fluid. The resin sealing member 13 is formed from a BMC(Bulk Molding Compound). In the present embodiment, the resin sealingmember 13 is formed by placing the stator 11 in a mold, and injectingand curing a resin material inside the mold. That is to say, the resinsealing member 13 is integrally molded with the stator 11 by means ofinsert molding.

When insert molding is performed, the resin sealing member 13 is moldedby injecting a resin into a mold in a state where which the stator core51 is placed inside the mold and positioned in the radial direction andin the axis line L direction by bringing the stator core 51 into contactwith the mold. Consequently, the accuracy with which the stator core 51and the resin sealing member 13 are relatively positioned is improved.For example, a cylinder-shaped mold section is provided in advance inthe mold, and the outer peripheral surface of the mold section isbrought into contact with the inner peripheral side end surfaces 57 a ofthe salient pole portions 57 to position the stator core 51 in theradial direction. As a result, as described above, the inner peripheralside end surfaces 57 a of the salient pole portions 57 of the statorcore 51 are exposed from the resin sealing member 13. Furthermore, wheninsert molding is performed, the mold is provided in advance with afirst contact section capable of making contact with the output side endsurfaces 57 b of the salient pole portions 57, and a second contactsection capable of making contact with the output side end surface 56 bof the annular portion 56, the stator core 51 is positioned in the axisline L direction by bringing the first contact section and the secondcontact section into contact with the stator core 51. Consequently, asdescribed above, a section of the output side end surface 57 b of eachsalient pole portions 57 of the stator core 51 is exposed on the outputside L1. Moreover, an outer peripheral section of the output side endsurface 56 b of the annular portion 56 is exposed on the output side L1.

As shown in FIG. 4, a plurality of holes 17 are formed in the sealingmember bottom portion 65 which are continuous from the counter outputside L2 surface of the sealing member bottom portion 65 to the counteroutput side L2 end surface of the insulator 52. In the presentembodiment, six holes 17 are formed in the sealing member bottom portion65. Specifically, a set of two holes 17 arranged with a 40° pitch aroundthe axis line L are formed in three locations with a 120° pitch. Theholes 17 have a shape that support pressing pins for the stator 11 setinside the mold to be pressed in the axis line L direction against asupport surface (the first contact section and the second contactsection described above) inside the mold at the time of molding.

(Cover Member)

FIG. 7 is an exploded cross-sectional view of the motor, and shows astate in which the cover member 14 has been detached from the resinsealing member 13. The cover member 14 is made of resin, and is securedon the output side L1 of the resin sealing member 13. The cover member14 includes a disk-shaped cover member ceiling portion 91, and a covermember cylindrical portion 92 that protrudes from the cover memberceiling portion 91 on the counter output side L2. The center of thecover member ceiling portion 91 is provided with a through hole 93 whichpasses through in the axis line L direction. A circular concave portion94 surrounding the through hole 93 is provided at the center of theoutput side L1 surface of the cover member ceiling portion 91, and anannular seal member 95 is disposed on the circular concave portion 94.The seal member 95 is disposed in the gap between the rotating shaft 5and the cover member 14.

As shown in FIG. 4 and FIG. 7, the central section of the counter outputside L2 surface of the cover member ceiling portion 91 is provided witha bearing member retaining cylindrical portion 97 positioned coaxiallywith respect to the through hole 93. As shown in FIG. 2A, FIG. 2B, andFIG. 7, the second bearing member 16 is retained in the center hole ofthe bearing member retaining cylindrical portion 97. The second bearingmember 16 is an identical member to the first bearing member 15described above, which is disposed in the opposite axis line Ldirection. That is to say, the second bearing member 16 is made ofresin, and includes a cylindrical support portion provided with athrough hole in which the rotating shaft 5 is disposed, and a flangeportion that expands from the output side L1 end portion of thecylindrical portion toward the outer peripheral side. The second bearingmember 16 is secured to the bearing member retaining cylindrical portion97 in a state where the flange portion is making contact with thebearing member retaining cylindrical portion 97 from the counter outputside L2. In the second bearing member 16, the support portion throughwhich the rotating shaft 5 is inserted functions as a radial bearing ofthe rotating shaft 5, and the flange portion functions as a thrustbearing of the rotor 10. That is to say, the second bearing plate 46secured to the retaining member 21 of the rotor 10 slides on the flangeportion of the second bearing member 16.

FIG. 8 is a plan view of the cover member 14 viewed from the counteroutput side L2. As shown in FIG. 4, FIG. 7 and FIG. 8, an annular covermember side securing surface 72 that connects to the inner peripheralsurface of the cover member cylindrical portion 92 is provided along theouter peripheral edge of the counter output side L2 surface of the covermember ceiling portion 91. Further, a circular inner annular rib 99 isprovided between the bearing member retaining cylindrical portion 97 andthe cover member side securing surface 72 on the counter output side L2surface of the cover member ceiling portion 91. The bearing memberretaining cylindrical portion 97, the cover member side securing surface72, and the inner annular rib 99 are coaxially provided. Moreover, aplurality of radial ribs 98 and a plurality of first adhesive agentreservoir portions 100 are provided between the inner annular rib 99 andthe cover member side securing surface 72. In addition, a plurality ofradial ribs 96 is provided between the inner annular rib 99 and thebearing member retaining cylindrical portion 97.

The inner annular rib 99 and the radial ribs 98 and 96 are convexportions that protrude on the counter output side L2. Furthermore, thefirst adhesive agent reservoir portions 100 are concave portions whichrecess further on the output side L1 than the cover member side securingsurface 72 and the tip surfaces 98 a of the radial ribs 98. The firstadhesive agent reservoir portions 100 are concave portions that utilizethe hollow shape of the cover member 14. That is to say, the firstadhesive agent reservoir portions 100 double as the hollow shape of thecover member 14. Moreover, concave portions serving as a hollow shapeare also formed on the inner peripheral side of the inner annular rib 99between the radial ribs 96.

In the present embodiment, eight radial ribs 98 are radially disposed atan angular interval of 45 degrees. Furthermore, the radial ribs 96 aredisposed at the same angular positions as the radial ribs 98. The firstadhesive agent reservoir portions 100 are substantially fan-shapedconcave portions provided between two radial ribs 98 that are adjacentin the circumferential direction, and are provided in eight locations inthe present embodiment. The first adhesive agent reservoir portions 100are partitioned on both circumferential direction sides by the radialribs 98, and are partitioned on the inner peripheral side by the innerannular rib 99. Moreover, the first adhesive agent reservoir portions100 are disposed on the inner peripheral side of the cover member sidesecuring surface 72.

The amount of protrusion of the bearing member retaining cylindricalportion 97 toward the counter output side L2 is greater than the amountof protrusion of the inner annular rib 99. Furthermore, the innerannular rib 99 and the radial ribs 96 protrude further on the counteroutput side L2 than the cover member side securing surface 72. On theother hand, the tip surfaces 98 a of the radial ribs 98 are positionedon the same plane as the cover member side securing surface 72. The tipsurface of the bearing member retaining cylindrical portion 97, the tipsurface of the inner annular rib 99, the tip surfaces of the radial ribs98 and 96, and the cover member side securing surface 72 are all planeswhich are perpendicular to the axis line L. Chamfered surfaces areprovided on the edges the first adhesive agent reservoir portions 100 onthe outer peripheral side and in both circumferential directions. Thatis to say, a chamfered surface 72 a is provided on the inner peripheralside edge of the cover member side securing surface 72. Furthermore,chamfered surfaces 98 b are provided at the corner portions where thetip surfaces 98 a and side surfaces of the radial ribs 98 are connected.Chamfered surfaces are also provided on the edges of the radial ribs 96and the inner annular rib 99.

As shown in FIG. 4 and FIG. 7, the inside diameter of the cover membercylindrical portion 92 increases stepwise from the output side L1 towardthe counter output side L2. That is to say, the inner peripheral surfaceof the cover member cylindrical portion 92 includes, in order from theoutput side L1, a first small diameter inner peripheral surface 92 a, asecond small diameter inner peripheral surface 92 b, and a largediameter inner peripheral surface 92 c. The cover member side positionregulating surface 73, which is an annular step surface facing thecounter output side L2, is formed on the boundary section between thesecond small diameter inner peripheral surface 92 b and the largediameter inner peripheral surface 92 c. The cover member side positionregulating surface 73 is a plane orthogonal to the axis line L.

The cover member cylindrical portion 92 includes an upper annularcylindrical section 92 d, which overlaps with the small diametercylindrical section 82 of the resin sealing member 13 in the axis line Ldirection and covers the small diameter cylindrical section 82 of theresin sealing member 13 from the outer peripheral side, and a lowerannular cylindrical section 92 e, which is positioned on the outerperipheral side of the large diameter cylindrical section 81 of theresin sealing member 13. The upper annular cylindrical section 92 d is asection further on the output side L1 than the cover member sideposition regulating surface 73. Furthermore, the lower annularcylindrical section 92 e is a protrusion portion that protrudes furtheron the counter output side L2 than the cover member side positionregulating surface 73, and covers the outer peripheral side of the resinsealing member 13.

As shown in FIG. 4, the lower annular cylindrical section 92 e of thecover member cylindrical portion 92 is provided with rotation engagementportions 86 that engage the engagement protrusion portions 85 of theresin sealing member 13 in four locations in the circumferentialdirection. As shown in FIG. 3 and FIG. 4, the rotation engagementportions 86 in three of the four locations are first rotation engagementportions 86A, which include a groove portion 861 which extends from thecounter output side L2 edge of the cover member cylindrical portion 92toward the output side L1 and a substantially rectangular notchedportion 862 which is connected to the groove portion 861 and extends inthe circumferential direction. The remaining location is a secondrotation engagement portion 86B, which includes a notched portion 863which extends from the counter output side L2 edge of the cover membercylindrical portion 92 toward the output side L1, and a notched portion864 connected to the notched portion 863 and which extends in thecircumferential direction. The second rotation engagement portion 86Bhas an elastically deformable arm portion 865 provided on the counteroutput side L2 of the notched portion 864, and the arm portion 865 isprovided with a hook portion 866 which is capable of engaging theengagement protrusion portion 85 in the circumferential direction.

(Positioning Structure and Securing Structure of Cover Member)

The cover member 14 is covered by the resin sealing member 13 from theoutput side L1 in a state where the rotor 10 is disposed on the insideof the resin sealing member 13, and the rotor 10 is supported by thefirst bearing member 15. When the resin sealing member 13 is covered bythe cover member 14, as shown in FIG. 2A and FIG. 2B, a lower endsection of the inner annular rib 99 is fitted to the inner peripheralside of the sealing member cylindrical portion 67 of the resin sealingmember 13. Consequently, the cover member 14 and the resin sealingmember 13 are positioned in the radial direction, and the axis line L ofthe rotating shaft 5 coincides with the central axis line of the stator11. The cover member 14 is positioned in the axis line L direction as aresult of the cover member side position regulating surface 73 providedon the cover member cylindrical portion 92 making contact in the axisline L direction with the resin sealing member side position regulatingsurface 70, which is a step surface provided on the outer peripheralsurface of the resin sealing member 13. Consequently, the cover memberceiling portion 91 covers the rotor 10 and the resin sealing member 13from above in a state where the rotating shaft 5 is passing throughcover member ceiling portion 91 in the vertical direction. Furthermore,a seal member 95 disposed in a circular concave portion 94 of the covermember ceiling portion 91 seals together the rotating shaft 5, the covermember 14, and the second bearing member 16. In addition, the covermember cylindrical portion 92 surrounds an output side L1 section of theresin sealing member 13 from the outer peripheral side.

Thereafter, the cover member 14 and the resin sealing member 13 arerelatively rotated in the circumferential direction, and as shown inFIG. 1, the engagement protrusion portions 85 of the resin sealingmember 13 and the rotation engagement portions 86 (the first rotationengagement portions 86A and the second rotation engagement portion 86B)of the cover member 14 engage each other. That is to say, the covermember 14 is rotated in the circumferential direction with respect tothe resin sealing member 13 in a state where the four engagementprotrusion portions 85 are inserted into the groove portions 861 or thenotched portions 863 such that the engagement protrusion portions 85engage the notched portions 862 and 864. The cover member 14 and theresin sealing member 13 are positioned in the circumferential directionas a result of the engagement protrusion portion 85 in one of the fourlocations engaging the hook portion 866 provided on the second rotationengagement portion 86B. When the procedure that relatively rotates thecover member 14 and the resin sealing member 13 in the circumferentialdirection is performed manually, the resin sealing member 13 can berelatively rotated with respect to the cover member 14 by supporting theresin sealing member 13 using the connector sealing portion 66, whichprojects from the sealing member cylindrical portion 67 on the outerperipheral side, as a fulcrum.

FIG. 9A and FIG. 9B is an enlarged cross-sectional view of the adhesivesecuring portion between the resin sealing member side securing surface71 and the cover member 14, where FIG. 9A is an enlarged cross-sectionalview of the adhesive securing portion between the resin sealing memberside securing surface 71 and the cover member side securing surface 72(radial direction partial cross-sectional view), and FIG. 9B is anenlarged cross-sectional view of the adhesive securing portion betweenthe resin sealing member side securing surface 71 and the radial rib 98(circumferential direction partial cross-sectional view). When the covermember 14 is covered by the resin sealing member 13, an adhesive agentis applied to the resin sealing member side securing surface 71 which isan output side L1 end surface of the sealing member cylindrical portion67 (see FIG. 3 and FIG. 7). When the cover member side positionregulating surface 73 and the resin sealing member side positionregulating surface 70 are brought into contact in the axis line Ldirection, the resin sealing member side securing surface 71 faces thecover member side securing surface 72 and the tip surface 98 a of theradial rib 98 with a predetermined gap.

The adhesive agent applied to the resin sealing member side securingsurface 71 is cured in a state where the gap is filled between the resinsealing member side securing surface 71 and the cover member sidesecuring surface 72, and between the resin sealing member side securingsurface 71 and the tip surface 98 a of the radial rib 98. Therefore, asshown in FIG. 9A, the cover member side securing surface 72 is securedto the resin sealing member side securing surface 71 via the adhesivelayer 110. Further, as shown in FIG. 9B, the tip surface 98 a of theradial rib 98 is secured to the resin sealing member side securingsurface 71 via the adhesive layer 110. The resin sealing member sidesecuring surface 71 and the cover member side securing surface 72 areboth annular surfaces, and are provided on the entire circumference ofthe cover member 14. Therefore, because the adhesive agent layer 110 isformed on the entire circumference, the waterproof properties areensured by the adhesive agent layer 110.

Here, if the cover member 14 and the resin sealing member 13 arerelatively rotated in the circumferential direction before curing theadhesive so that the engagement protrusion portions 85 and the rotationengagement portions 86 engage each other, the adhesive agent applied tothe resin sealing member side securing surface 71 can be spread in thecircumferential direction. Therefore, the adhesive agent can bedistributed to the locations where adhesion is desired, and the adhesiveagent can be distributed with certainty over the entire circumference.Furthermore, if the cover member 14 and the resin sealing member 13 arerelatively rotated in the circumferential direction, the adhesive agententers between the chamfered surface 98 b provided at a corner portionof the radial rib 98 and the resin sealing member side securing surface71. When an adhesive agent with a low viscosity is used, surface tensioncauses the adhesive agent to collect in a section with a wide gap. Inother words, the adhesive agent collects along the edges of the covermember side securing surface 72 and the radial rib 98, which areprovided with the chamfered surfaces 72 a and 98 b.

The first adhesive agent reservoir portion 100 is provided in a positionadjacent in the inner peripheral side with respect to the cover memberside securing surface 72. Therefore, when excessive adhesive agent isapplied to the resin sealing member side securing surface 71, theadhesive agent protruding on the inner peripheral side of the covermember side securing surface 72 is retained by the first adhesive agentreservoir portion 100. Therefore, entry of the adhesive agent toward therotor 10 side is suppressed. Furthermore, the adhesive agent protrudingon both circumferential direction sides of the radial rib 98 is alsoretained by the first adhesive agent reservoir portion 100.

The cover member 14 includes a second adhesive agent reservoir portion101 provided between the cover member side securing surface 72 and thecover member side position regulating surface 73. That is to say, asshown in FIG. 2B, a first small diameter inner peripheral surface 92 aand a second small diameter inner peripheral surface 92 b are providedbetween the cover member side securing surface 72 and the cover memberside position regulating surface 73, but the second small diameter innerperipheral surface 92 b is disposed so as to leave a predetermined gapin the radial direction with the outer peripheral surface of the smalldiameter cylindrical section 82 of the resin sealing member 13. This gapbecomes the second adhesive agent reservoir portion 101. Therefore, whenan excessive amount of adhesive agent is applied to the resin sealingmember side securing surface 71, the adhesive agent protruding on theouter peripheral side from the cover member side securing surface 72 isretained by the second adhesive agent reservoir portion 101. Therefore,the adhesive agent is prevented from protruding from the gap between thecover member 14 and the resin sealing member 13 toward the outerperipheral surface of the motor 2.

(Positional Relationship between Gate Marks and Radial Ribs)

The cover member 14 is a resin molded article. As shown in FIG. 3, aplurality of gate marks 102, which are marks from a resin injection portinto the mold, are formed on the output side L1 surface of the covermember 14. The plurality of gate marks 102 are annularly disposed atequal angular intervals around the rotating shaft 5. For example, in thepresent embodiment, the gate marks 102 are formed in four locations at a90° pitch around the rotating shaft 5. On the other hand, the pluralityof radial ribs 98 are disposed at equal angular intervals around therotating shaft 5 on the counter output side L2 surface of the covermember 14, and the radial ribs 98 are formed in positions correspondingto the positions of the gate marks 102. That is to say, the angularpositions of the gate marks 102 and the radial ribs 98 are set such thatcircumferential direction midpoints P of gate marks 102 that areadjacent to each other in the circumferential direction coincide withcertainty with the positions in which one of the plurality of radialribs 98 is formed.

In the present embodiment, as shown in FIG. 8, the four gate marks 102are each provided in positions overlapping with four of the eight radialribs 98 when viewed in the axis line L direction. Further, thecircumferential direction midpoints P of gate marks 102 that areadjacent to each other in the circumferential direction are each inpositions overlapping with the radial ribs 98 when viewed in the axisline L direction. More specifically, the angular positions of the gatemarks 102 and the radial ribs 98 are set such that the central positionsof the circumferential direction widths of the radial ribs 98 and themidpoints P overlap when viewed in the axis line L direction. Thecircumferential direction midpoints P of the gate marks 102 coincidewith locations (weld lines P1: imaginary lines indicated bysingle-dotted chain line in FIG. 3) at which the resin flowing in fromadjacent gates merge at the time of molding the cover member 14.Therefore, by matching the angular positions of the midpoints P and theangular positions of the radial ribs 98, the radial ribs 98 can beformed on the weld line P1, and the strength of the cover member 14 canbe ensured as a result of the radial ribs 98 reinforcing the sectionsoverlapping the weld line P1.

Main Effects of Present Embodiment

As described above, in the motor 2 and the pump device 1 of the presentembodiment, the position regulating surfaces at which the cover member14 and the resin sealing member 13 of the motor 2 make contact (thecover member side position regulating surface 73 and the resin sealingmember side position regulating surface 70), and the securing surfacesat which the cover member 14 and the resin sealing member 13 are securedby an adhesive agent (the cover member side securing surface 72 and theresin sealing member side securing surface 71) are separately provided.Therefore, the cover member 14 and the resin sealing member 13 can bebrought into contact and positioned with a high accuracy, while beingconfigured such that the securing surfaces of both members face eachother with a gap in which the adhesive agent is disposed. Therefore, theaccuracy with which the cover member 14 can be positioned in the axisline L direction with respect to the resin sealing member 13 can beimproved. Furthermore, by using an adhesive agent to secure the resinsealing member 13 and the cover member 14, it is not necessary toprovide a securing structure such as a screw securing portion or a hook.Therefore, the structure of the securing location can be simplified.

In the present embodiment, because a first adhesive agent reservoirportion 100 is provided which recesses further on the output side L1(first side in the axis line L direction) than the cover member sidesecuring surface 72, the adhesive agent that protrudes from the covermember side securing surface 72 is retained in the first adhesive agentreservoir portion 100. Therefore, even if the application amount of theadhesive agent is not strictly controlled, adverse effects that arisedue to protrusion of the adhesive agent caused by excessive applicationcan be suppressed. Furthermore, because the first adhesive agentreservoir portion 100 doubles as a hollow shape of the cover member 14,the molding properties of the cover member 14 can be improved.

In the present embodiment, because the cover member side securingsurface 72 is disposed on an outer peripheral side of the first adhesiveagent reservoir portion 100, if the adhesive agent is excessivelyapplied, the adhesive agent that protrudes on the inner peripheral sideis accommodated in the first adhesive agent reservoir portion 100, andthe likelihood of the protruding adhesive agent reaching the rotor 10 islow. Therefore, adverse effects that arise due to protrusion of theadhesive agent can be suppressed.

In at least an embodiment of the present invention, a plurality of firstadhesive agent reservoir portions 100 are formed, and radial ribs 98which are convex portions that protrude on the counter output side L2(the second side in the axis line L direction) and at the same height asthe cover member side securing surface 72 are formed between theplurality of first adhesive agent reservoir portions 100. Therefore,because the tip surfaces of the radial ribs 98 can be used as a securingsurface for securing purposes by the adhesive agent, the area of thesecuring surface can be ensured. Furthermore, the strength of the covermember 14 can be ensured by means of the radial ribs 98. In addition,the radial ribs 98 extend radially inward from the cover member sidesecuring surface 72, and the securing surface can be extended to theinner peripheral side. Therefore, the securing strength can be ensured.Moreover, because the adhesive agent collects along the edge of theradially extending rib due to surface tension, the detent effect of thecover member 14 can be increased.

In the present embodiment, a resin molded article is used as the covermember 14 which is secured to the resin sealing member 13, and the covermember 14 has radial ribs 98 formed in positions overlapping each of themidpoints P of adjacent gate marks 102 in the axis line L direction.Therefore, the radial ribs 98 are capable of reinforcing the locations(weld lines) at which the resin flowing in from adjacent gates merges atthe time of molding the cover member 14. In particular, in the presentembodiment, because the gate marks 102 are annularly disposed around therotating shaft 5 and the radial ribs 98 extend in the radial directionaround the rotating shaft 5, the radial ribs 98 can be disposed alongthe weld lines. Therefore, the strength of the cover member can beensured.

In the present embodiment, because the cover member side securingsurface 72 includes the chamfered surface 72 a formed on an edgeadjacent to the first adhesive agent reservoir portion 100, surfacetension of the adhesive agent can be used to collect the adhesive agenton the edge of the cover member side securing surface 72. Therefore, thesecuring strength can be increased. Furthermore, because the chamferedsurfaces 98 b are also formed on the edge of the tip surfaces of theradial ribs 98, surface tension of the adhesive agent can be used tocollect the adhesive agent along the edges of the radial ribs 98.Therefore, the securing strength can be increased. Moreover, bycollecting the adhesive agent along the edges of the radial ribs 98, thedetent effect of the cover member 14 can be increased.

In the present embodiment, the resin sealing member side positionregulating surface 70 is disposed further on the counter output side L2(second side in the axis line L direction) than the resin sealing memberside securing surface 71, and the second adhesive agent reservoirportion 101 is formed between the cover member side position regulatingsurface 73 and the cover member side securing surface 72. Consequently,if the adhesive is excessively applied, because the adhesive thatprotrudes on the outer peripheral side is accommodated in the secondadhesive agent reservoir portion 101, the likelihood of the protrudingadhesive agent reaching the cover member side position regulatingsurface 73 is low. Therefore, it is possible to suppress a reduction inthe accuracy with which the cover member 14 is positioned in the axisline L direction with respect to the resin sealing member 13 due toprotrusion of the adhesive agent. Furthermore, the second adhesive agentreservoir portion 101 can suppress the protrusion of the adhesive agenttoward the outer peripheral surface of the motor.

In the present embodiment, the cover member 14 includes a lower annularcylindrical section 92 e of the cover member cylindrical portion 92,which is a protrusion portion that protrudes further on the counteroutput side L2 (the second side in the axis line L direction) than thecover member side position regulating surface 73 and covers the outerperipheral side of the resin sealing member 13. Therefore, the cornerportion at which the outer peripheral surface of the resin sealingmember 13 and the resin sealing member side position regulating surface70 are connected can be protected by the cover member 14. Moreover, ifthe outer peripheral surface of the resin sealing member 13 isconfigured such that the entire circumference is covered by the lowerannular cylindrical section 92 e of the cover member cylindrical portion92, water and the like can be prevented from entering between the covermember 14 and the resin sealing member 13, yielding a waterproof effect.

In the present embodiment, because the engagement protrusion portions 85are provided on the outer peripheral surface of the resin sealing member13, and the rotation engagement portions 86 (the first rotationengagement portions 86A and the second rotation engagement portion 86B)that engage the engagement protrusion portions 85 by means of relativerotation of the cover member 14 with respect to the resin sealing member13 around the axis line L are provided on the lower annular cylindricalsection 92 e of the cover member cylindrical portion 92, the adhesiveagent can be spread in the circumferential direction because the covermember 14 is relatively rotated with respect to the resin sealing member13 when the engagement protrusion portions 85 and the rotationengagement portions 86 engage each other.

In the present embodiment, because the cover member side securingsurface 72 and the resin sealing member side securing surface 71 areprovided on the entire circumference, the adhesive agent can bedelivered over the entire circumference. Therefore, the adhesive agentis capable of preventing water and the like from entering the rotor 10side, and a waterproof effect can be provided. Therefore, an O-ring canbe omitted, and costs can be reduced. Furthermore, for example, becausea rotating engagement structure is provided by means of the rotationengagement portions 86 and the engagement protrusion portions 85provided between the cover member 14 and the resin sealing member 13 asdescribed above, the adhesive agent can be distributed over the entirecircumference due to the rotation of the cover member 14, enabling awaterproof function to be provided and for malfunctions such as thetwisting of the O-ring caused by rotation of the cover member 14 to beresolved.

In the present embodiment, the stator 11 includes a substantiallyannular stator core 51, at least an outer peripheral section of theoutput side end surface 56 b of the stator core 51 is exposed from theresin sealing member 13, and the resin sealing member side positionregulating surface 70 is provided on the outer peripheral side of theoutput side end surface 56 b and positioned on the same plane as theoutput side end surface 56 b. Therefore, the outer peripheral side ofthe end surface of the stator core 51, which is positioned so as to makecontact with the mold at the time of molding, can be covered andinsulated by the cover member 14.

Embodiment 2

Next, a pump device 1 according to at least an embodiment of the presentinvention is described. The basic configuration of the presentembodiment is the same as that of Embodiment 1, and therefore isdescribed using FIG. 2A and FIG. 2B.

In Embodiment 2, a resin sealing member side position regulating surface70 is formed on the outer peripheral surface of the sealing membercylindrical portion 67 of the resin sealing member 13, which is astepped surface facing the output side L1 at the boundary sectionbetween the small diameter cylindrical section 82 and the large diametercylindrical section 81. Furthermore, the small diameter cylindricalsection 82 of the sealing member cylindrical portion 67 of the resinsealing member 13 serves as a resin sealing member side securingsurface.

The inner peripheral surface of the cover member cylindrical portion 92of the cover member 14 includes, in order from the output side L1, afirst small diameter inner peripheral surface 92 a, a second smalldiameter inner peripheral surface 92 b, and a large diameter innerperipheral surface 92 c, and a cover member side position regulatingsurface 73 is formed on the boundary section between the second smalldiameter inner peripheral surface 92 b and the large diameter innerperipheral surface 92 c, which is an annular stepped surface facing thecounter output side L2. Furthermore, at least either the first smalldiameter inner peripheral surface 92 a or the second small diameterinner peripheral surface 92 b serves as a cover member side securingsurface.

Therefore, the small diameter cylindrical section 82 which serves as aresin sealing member side securing surface faces, with a predeterminedgap, at least either the first small diameter inner peripheral surface92 a or the second small diameter inner peripheral surface 92 b, whichserve as cover member side securing surfaces. The cover member 14 issecured to the resin sealing member 13 by an adhesive agent disposed inthe gap between the resin sealing member side securing surface and thecover member side securing surfaces.

That is to say, the resin sealing member 13 includes a resin sealingmember side position regulating surface that makes contact in the axisline direction with a cover member side position regulating surfaceprovided on the cover member 14, and a resin sealing member sideposition regulating surface that faces, in a direction orthogonal to theaxis line direction and with a gap, the cover member side securingsurface provided on the cover member 14, where at least a portion of theresin sealing member side securing surface is secured to the covermember side securing surface via an adhesive agent layer. Furthermore,the cover member 14 includes a cover member ceiling portion 91 and acover member cylindrical portion 92 which protrudes from the covermember ceiling portion 91 toward the second side in the axis linedirection, wherein the cover member cylindrical portion serves as acover member side securing surface, and the outer peripheral surface ofthe resin sealing member 13 serves as a resin sealing member sidesecuring surface.

As described above, Embodiment 2 and Embodiment 1 are different withrespect to the formation positions that the resin sealing member sidesecuring surface and the cover member side securing surfaces are formed.The other aspects are the same as Embodiment 1.

(Modifications)

(1) The cover member 14 of the present embodiment is provided with eightradial ribs 98 and eight first adhesive agent reservoir portions 100between the inner annular rib 99 and the cover member side securingsurface 72, however the number, size, and positions of the radial ribs98 may be changed as appropriate. For example, it is possible for justfour radial ribs 98 to be provided that pass through intermediatepositions in the circumferential direction of gate marks 102 that areadjacent to each other in the circumferential direction. Furthermore,the number, size, and positions of the first adhesive agent reservoirportions 100 may be changed as appropriate. Moreover, at least anembodiment of the present invention is also applicable to cases wherethe number of gate marks 102 is not four.

(2) The cover member 14 and the resin sealing member 13 of the presentembodiment is provided with a rotating engagement structure constitutedby engagement protrusion portions 85 and rotation engagement portions 86(the first rotation engagement portions 86A and the second rotationengagement portion 86B), however such a rotating engagement structuredoes not have to be provided. If a rotating engagement structure is notprovided, the entire circumference of the outer peripheral surface ofthe resin sealing member 13 can be covered by the lower annularcylindrical section 92 e of the cover member cylindrical portion 92.Therefore, because thin sections of the BMC resin coating layer can becovered by the lower annular cylindrical section 92 e, the insulatingeffect can be enhanced. Furthermore, the waterproof effect can beenhanced.

(3) In the cover member 14 and the resin sealing member 13 of thepresent embodiment, the rotating engagement structure is constituted byforming the engagement protrusion portions 85 on the resin sealingmember 13 and the rotation engagement portions 86 on the cover member14, however a mode can also be employed in which the engagementprotrusion portions are formed on the cover member 14 and the rotationengagement portions are formed on the resin sealing member.

While the description above refers to particular embodiments of thepresent invention, it will be understood that many modifications may bemade without departing from the spirit thereof. The accompanying claimsare intended to cover such modifications as would fall within the truescope and spirit of the present invention.

The presently disclosed embodiments are therefore to be considered inall respects as illustrative and not restrictive, the scope of theinvention being indicated by the appended claims, rather than theforegoing description, and all changes which come within the meaning andrange of equivalency of the claims are therefore intended to be embracedtherein.

1. A motor comprising: a rotor comprising a rotating shaft thatprotrudes to a first side in an axial direction; a stator disposed on anouter peripheral side of the rotor; a resin sealing member that coversthe stator; and a cover member that is disposed on the first side of theresin sealing member and supports the rotating shaft; wherein the resinsealing member comprises a resin sealing member side position regulatingsurface that makes contact in the axial direction with a cover memberside position regulating surface provided on the cover member, and aresin sealing member side securing surface that faces, in the axialdirection and with a gap, a cover member side securing surface providedon the cover member; and at least a portion of the resin sealing memberside securing surface is secured to the cover member side securingsurface via an adhesive agent layer.
 2. The motor according to claim 1,wherein the cover member comprises a first adhesive agent reservoirportion which recesses further on the first side than the cover memberside securing surface.
 3. The motor according to claim 2, wherein thefirst adhesive agent reservoir portion is shaped as a hollow shape ofthe cover member.
 4. The motor according to claim 2, wherein the covermember side securing surface is disposed on an outer peripheral side ofthe first adhesive agent reservoir portion.
 5. The motor according toclaim 2, wherein the first adhesive agent reservoir portion is one of aplurality of first adhesive agent reservoir portions, and a convexportion that protrudes on a second side in the axial direction, and atthe same height as the cover member side securing surface, is formedbetween the plurality of first adhesive agent reservoir portions.
 6. Themotor according to claim 1, wherein the resin sealing member sideposition regulating surface is disposed further on a second side in theaxial direction than the resin sealing member side securing surface, anda second adhesive agent reservoir portion is formed between the covermember side position regulating surface and the cover member sidesecuring surface.
 7. The motor according to claim 1, wherein the covermember comprises a protrusion portion which protrudes further on asecond side in the axial direction than the cover member side positionregulating surface, and covers an outer peripheral side of the resinsealing member.
 8. The motor according to claim 7, wherein an entirecircumference of an outer peripheral surface of the resin sealing memberis covered by the protrusion portion.
 9. The motor according to claim 7,wherein an engagement protrusion portion is provided on an outerperipheral surface of the resin sealing member, and the protrusionportion comprises a rotation engagement portion that engages theengagement protrusion portion by rotating the cover member around anaxis of the rotor in a state where the cover member side positionregulating surface and the resin sealing member side position regulatingsurface are in contact with each other.
 10. The motor according to claim1, wherein the cover member side securing surface and the resin sealingmember side securing surface are provided on an entire circumference ofthe cover member.
 11. The motor according to claim 1, wherein the statorincludes a substantially annular stator core, at least an outerperipheral section of an end surface on the first side of the statorcore is exposed from the resin sealing member, and the resin sealingmember side position regulating surface is provided on an outerperipheral side of the end surface and is positioned on the same planeas the end surface.
 12. A motor comprising: a rotor comprising arotating shaft that protrudes to a first side in an axial direction; astator disposed on an outer peripheral side of the rotor; a resinsealing member that covers the stator; and a cover member that isdisposed on the first side of the resin sealing member and supports therotating shaft; wherein the resin sealing member includes a resinsealing member side position regulating surface that makes contact inthe axial direction with a cover member side position regulating surfaceprovided on the cover member, and a resin sealing member side securingsurface that faces, in a direction orthogonal to the axial direction andwith a gap, a cover member side securing surface provided on the covermember; and at least a portion of the resin sealing member side securingsurface is secured to the cover member side securing surface via anadhesive agent layer.
 13. The motor according to claim 12, wherein thecover member comprises a cover member ceiling portion and a cover membercylindrical portion that protrudes to a second side in the axialdirection from the cover member ceiling portion, the cover member sidesecuring surface serves as a cover member cylindrical portion, and theresin sealing member side securing surface serves as an outer peripheralsurface of the resin sealing member.
 14. A pump device comprising: amotor comprising: a rotor comprising a rotating shaft that protrudes toa first side in an axial direction; a stator disposed on an outerperipheral side of the rotor; a resin sealing member that covers thestator; and a cover member that is disposed on the first side of theresin sealing member and supports the rotating shaft; wherein the resinsealing member comprises a resin sealing member side position regulatingsurface that makes contact in the axial direction with a cover memberside position regulating surface provided on the cover member, and aresin sealing member side securing surface that faces, in the axialdirection and with a gap, a cover member side securing surface providedon the cover member; and at least a portion of the resin sealing memberside securing surface is secured to the cover member side securingsurface via an adhesive agent layer; and an impeller attached to an endportion of the rotating shaft which passes through the cover member andprotrudes on the first side of the cover member.